Hello Miriam,
If you need to visit the library only once, you call Mary Sengati-Zimba at 02-599-3880 to let her know so that she organizes permission for you to get into the University, and then into the library.
If you need to use it on a regular basis as a research affiliate, then you send an email message to Mary.Sengati-Zimba@zu.ac.ae, letting her know about your research needs and academic affiliation, and for how long you anticipate using the library.